參數(shù)資料
型號(hào): MIC38C45
廠商: Micrel Semiconductor,Inc.
英文描述: BiCMOS Current-Mode PWM Controllers
中文描述: 的BiCMOS電流模式PWM控制器
文件頁(yè)數(shù): 11/12頁(yè)
文件大?。?/td> 104K
代理商: MIC38C45
MIC38C42/3/4/5
Micrel
MIC38C42/3/4/5
8
August 2000
ripple. This inductance value also improves circuit efficiency
by reducing the flux swing in L1.
Magnetic components are carefully chosen for minimal loss
Symbol
Custom Coil1
ETS2
CT1
4923
ETS 92420
T1
4924
ETS 92419
L1
4925
ETS 92421
1.
Custom Coils, Alcester, SD
tel: (605) 934-2460
2.
Energy Transformation Systems, Inc.
tel: (415) 324-4949.
Test
Conditions
Results
Line Regulation
V
IN = 26V to 80V, IO = 2A
0.5%
Load Regulation V
IN = 48V, IO = 0.2A to 2A
0.6%
Efficiency
V
IN = 48V, IO = 2A
90%
Output Ripple
V
IN = 48V, IO = 2A (20MHz BW)
100mV
at 500kHz. CT1 and T1 are wound on Magnetics, Inc. P-type
material toroids. L1 is wound on a Siemens N49 EFD core.
Synchronous Buck Converter
Refer to figure 2. This MIC38C43 synchronous buck con-
verter uses an MIC5022 half-bridge driver to alternately drive
the PWM switch MOSFET (driven by GATEH, or high-side
output) and a MOSFET which functions as a synchronous
rectifier (driven by the GATEL, or low-side output).
The low-side MOSFET turns on when the high-side MOSFET
is off, allowing current to return from ground. Current flows
through the low-side MOSFET in the source to drain direc-
tion.
The on-state voltage drop of the low-side MOSFET is lower
than the forward voltage drop of an equivalent Schottky
rectifier. This lower voltage drop results in higher efficiency.
A sense resistor (5m
) is connected to the driver’s high-side
current sense inputs to provide overcurrent protection. Refer
to the MIC5020, MIC5021, and MIC5022 data sheets for
more information.
Figure 2. 100kHz, Synchronous Buck Converter
MIC38C43
0.1F
300k
4.3k
VOUT
5V, 8A
0.15F
35H
1000F
Low ESR
0.1F
SMP60N06-14
VDD
VREF
GND
COMP
VOUT
RT/CT
FB
ISNS
4.7nF
10k
6.8k
47k
3.3k
2200
pF
470F
25V
MIC5022
VB
GATEH
SH+
GATEL
SH–
SL+
CT
GND
EN
FLT
VDD
+12V
5m
0.1F*
MKS2
*Locate near the MIC38C43 supply pins.
NC
IN
NC
SL–
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MIC38C45-1BM TR 功能描述:IC REG CTRLR PWM CM 14-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR)
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